// user
var user_Boolean = false;

$('.reg_user').blur(function(){
  if ((/^[1-9]\d*$ /).test($(".reg_user").val())){
    $('.user_hint').html("✔").css("color","green");
    user_Boolean = true;
  }else {
    $('.user_hint').html("×").css("color","red");
    user_Boolean = false;
  }
});